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nLab

Strøm's theorem

###### Strøm’s theorem

Let $(X,A)$ and $(Y,B)$ be NDR-pairs. Their product in the category of topological pairs

$(X\times Y,X\times B\cup A\times Y)$

is also an NDR-pair.

Last revised on December 3, 2009 at 23:12:57.
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